Chemistry 9th Chap 6 : Topic 9 - Maryam Publications

Chemistry Chapter 6 : Topic 9

Chemical and Ionic Equations

1 / 20

Which of the following best represents a balanced chemical equation with correct state symbols?

A) 2H₂+O₂ → 2H₂O

B) 2H₂(g)+O₂(g) → 2H₂O(l)

C) H₂+O₂ → H₂O

D) H₂(g)+O₂(g) → H₂O(g)

2 / 20

What do state symbols (s), (l), (g), and (aq) represent in a chemical equation?

A) Energy changes

B) Temperature changes

C) Reaction speed

D) Physical states of substances

3 / 20

Which of the following correctly represents an aqueous solution?

A) NaCl(g)

B) NaCl(aq)

C) NaCl(s)

D) NaCl(l)

4 / 20

A chemical equation must be balanced to satisfy which law?

A) Law of gaseous volumes

B) Law of multiple ratios

C) Law of conservation of mass

D) Law of constant proportions

5 / 20

Which of the following is the correct form of an ionic equation?

A) NaCl(s) → Na⁺ + Cl⁻

B) Na(aq)⁺+Cl(aq)⁻+Ag(aq)⁺+NO₃(aq)⁻ → AgCl(s)+Na(aq)⁺+NO₃(aq)⁻

C) NaCl + AgNO₃ → AgCl + NaNO₃

D) Ag+NO₃ → AgNO₃

6 / 20

Which ions are spectator ions in the reaction forming silver chloride?

A) Na⁺ and NO₃⁻

B) Cl⁻ only

C) Ag⁺ and Cl⁻

D) Ag⁺ only

7 / 20

Which equation shows correct use of state symbols for precipitation reaction?

A) Ag+NaCl → AgCl

B) AgNO₃(s)+NaCl(s) → AgCl(g)+NaNO₃(l)

C) AgNO₃(l)+NaCl(l) → AgCl(aq)

D) AgNO₃(aq)+NaCl(aq) → AgCl(s)+NaNO₃(s)

8 / 20

What is the correct definition of a balanced chemical equation?

A) One that has equal atoms of each element on both sides

B) One that shows only products

C) One that contains only symbols

D) One that shows energy changes only

9 / 20

Which of the following is NOT an ionic species in aqueous solution?

A) H₂O molecules

B) Na⁺

C) NO₃⁻

D) Cl⁻

10 / 20

Which reaction is correctly written with state symbols?

A) Ca+CO₃ → CaCO₃

B) CaCO₃(s) → CaO(s)+CO₂(g)

C) CaCO₃ → CaO+CO₂

D) CaCO₃(l) → CaO(g)+CO₂(s)

11 / 20

Which of the following is the correct ionic equation for neutralization of HCl and NaOH?

A) H₂+O₂ → H₂O

B) HCl+NaOH → NaCl+H₂O

C) H(aq)⁺+OH(aq)⁻ → H₂O(l)

D) Na⁺+Cl⁻ → NaCl

12 / 20

Why are spectator ions omitted in net ionic equations?

A) They are not present in solution

B) They are gases

C) They do not participate in the chemical change

D) They are unstable

13 / 20

Which is the correct feature of an ionic equation?

A) Excludes aqueous substances

B) Shows only solids

C) Shows only molecular compounds

D) Shows all soluble ionic substances as ions

14 / 20

Which of the following correctly shows physical states in a combustion reaction?

A) CH₄+O₂ → CO₂+H₂O

B) CH₄(s)+O₂(l) → CO₂(s)+H₂O(g)

C) CH₄(aq)+O₂(aq) → products

D) CH₄(g)+2O₂(g) → CO₂(g)+2H₂O(l)

15 / 20

Which statement best describes a chemical equation?

A) It represents reactants and products symbolically

B) It shows only energy changes

C) It describes mixtures only

D) It shows only physical changes

16 / 20

In ionic equations, aqueous compounds are represented as:

A) Atoms

B) Solids

C) Ions

D) Molecules

17 / 20

Which is the correct reason for including state symbols in equations?

A) To show physical state of substances

B) To indicate color changes

C) To balance atoms

D) To show catalysts

18 / 20

Which of the following best represents a precipitation reaction in ionic form?

A) Two ions combine to form an insoluble solid

B) Two gases react

C) A solid dissolves completely

D) Ions remain unchanged

19 / 20

Which equation correctly shows decomposition with state symbols?

A) 2H₂O(l) → 2H₂(g)+O₂(g)

B) H₂O(s) → H₂+O₂

C) H₂O(g) → H₂(l)+O₂(s)

D) H₂O → H₂+O₂

20 / 20

The main purpose of writing a net ionic equation is to:

A) Show all ions present in solution

B) Show energy changes

C) Simplify the equation by removing spectator ions

D) Show only solid compounds

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